BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Nonequilibrium Quantum Workshop NQW - ECPv6.14.2//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:Nonequilibrium Quantum Workshop NQW X-ORIGINAL-URL:https://nqw.ijs.si X-WR-CALDESC:Events for Nonequilibrium Quantum Workshop NQW REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:Europe/Ljubljana BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20210328T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20211031T010000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20211212T140000 DTEND;TZID=Europe/Ljubljana:20211212T161500 DTSTAMP:20260810T030552 CREATED:20211201T212912Z LAST-MODIFIED:20211209T202059Z UID:1878-1639317600-1639325700@nqw.ijs.si SUMMARY:Registration DESCRIPTION: URL:https://nqw.ijs.si/event/registration/ CATEGORIES:NQW 2021 END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20211212T161500 DTEND;TZID=Europe/Ljubljana:20211212T163000 DTSTAMP:20260810T030552 CREATED:20211201T212912Z LAST-MODIFIED:20211203T223516Z UID:1879-1639325700-1639326600@nqw.ijs.si SUMMARY:Opening: NQW 2021 DESCRIPTION: URL:https://nqw.ijs.si/event/opening/ CATEGORIES:NQW 2021 END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20211212T162900 DTEND;TZID=Europe/Ljubljana:20211212T181000 DTSTAMP:20260810T030552 CREATED:20211203T222540Z LAST-MODIFIED:20211209T211005Z UID:2042-1639326540-1639332600@nqw.ijs.si SUMMARY:Chair: Lev Vidmar DESCRIPTION: URL:https://nqw.ijs.si/event/chair-lev-vidmar/ CATEGORIES:NQW 2021 END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20211212T163000 DTEND;TZID=Europe/Ljubljana:20211212T165500 DTSTAMP:20260810T030552 CREATED:20211201T213330Z LAST-MODIFIED:20211212T223311Z UID:1898-1639326600-1639328100@nqw.ijs.si SUMMARY:Marcin Mierzejewski: Phenomenology of spectral functions in disordered spin chains DESCRIPTION:L. Vidmar\,1\,2 B. Krajewski\,3 J. Bonča\,2\,1 M. Mierzejewski3 \n1Department of Theoretical Physics\, J. Stefan Institute\, SI-1000 Ljubljana\, Slovenia \n2Department of Physics\, Faculty of Mathematics and Physics\, University of Ljubljana\, \nSI-1000 Ljubljana\, Slovenia \n3Department of Theoretical Physics\, Wrocław University of Science and Technology\, \n50-370 Wrocław\, Poland \nStudies of disordered spin chains have recently experienced a renewed interest\, inspired by the question to which extent the exact numerical calculations comply with the existence of a many-body localization phase transition. For the paradigmatic random field Heisenberg spin chains\, many intriguing features were observed when the disorder is considerable compared to the spin interaction strength. Here\, we introduce a phenomenological theory that may explain some of those features. The theory is based on the proximity to the noninteracting limit\, in which the system is an Anderson insulator. Taking the spin imbalance as an exemplary observable\, we demonstrate that the proximity to the local integrals of motion of the Anderson insulator determines the dynamics of the observable at infinite temperature. In finite interacting systems our theory quantitatively describes its integrated spectral function for a wide range of disorders [1]. \n\nLev Vidmar\, Bartosz Krajewski\, Janez Bonca\, Marcin Mierzejewski\, arXiv:2105.09336\n\n\n\nWatch the lecture:\n\n \n Protected Area\n This content is password-protected. Please verify with a password to unlock the content. \n \n \n Enter your password\n \n \n Unlock URL:https://nqw.ijs.si/event/marcin-mierzejewski-phenomenology-of-spectral-functions-in-disordered-spin-chains/ CATEGORIES:NQW 2021 END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20211212T165500 DTEND;TZID=Europe/Ljubljana:20211212T172000 DTSTAMP:20260810T030552 CREATED:20211201T213330Z LAST-MODIFIED:20211212T223510Z UID:1899-1639328100-1639329600@nqw.ijs.si SUMMARY:Jacek Herbrych: Relaxation at different length-scales in models of many-body localization DESCRIPTION:J. Herbrych\,1 M. Mierzejewski\,1 P. Prelovšek2\,3 \n1Wrocław University of Science and Technology\, 50-370 Wrocław\, Poland \n2Jožef Stefan Institute\, SI-1000 Ljubljana\, Slovenia \n3University of Ljubljana\, SI-1000 Ljubljana\, Slovenia \nWe study dynamical correlation functions in the random-field Heisenberg chain\, which probe the relaxation times at different length scales. Firstly\, we show that the relaxation time associated with the dynamical imbalance (examining the relaxation at the smallest length scale) decreases with disorder much faster than the one determined by the dc conductivity (probing the global response of the system). We argue that the observed dependence of relaxation on the length scale originates from local nonresonant regions. The latter has particularly long relaxation times or remains frozen\, allowing for nonzero dc transport via higher-order processes. Based on the numerical evidence\, we introduce a toy model that suggests that the nonresonant regions‘ asymptotic dynamics are essential for the proper understanding of disordered chains. In addition\, the toy model explains the exponential dependence of the transport properties on the disorder and the broad distribution of dc conductivity. \n\n\nWatch the lecture:\n\n \n Protected Area\n This content is password-protected. Please verify with a password to unlock the content. \n \n \n Enter your password\n \n \n Unlock URL:https://nqw.ijs.si/event/jacek-herbrych-relaxation-at-different-length-scales-in-models-of-many-body-localization/ CATEGORIES:NQW 2021 END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20211212T172000 DTEND;TZID=Europe/Ljubljana:20211212T174500 DTSTAMP:20260810T030552 CREATED:20211201T213719Z LAST-MODIFIED:20211212T223849Z UID:1919-1639329600-1639331100@nqw.ijs.si SUMMARY:Federico Cilento: Time-Resolved Spectroscopy of Anisotropic Compounds - an Overview DESCRIPTION:Watch the lecture:\n\n \n Protected Area\n This content is password-protected. Please verify with a password to unlock the content. \n \n \n Enter your password\n \n \n Unlock URL:https://nqw.ijs.si/event/federico-cilento-time-resolved-spectroscopy-of-anisotropic-compounds-an-overview/ CATEGORIES:NQW 2021 END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20211212T174500 DTEND;TZID=Europe/Ljubljana:20211212T181000 DTSTAMP:20260810T030552 CREATED:20211201T213719Z LAST-MODIFIED:20211213T081537Z UID:1920-1639331100-1639332600@nqw.ijs.si SUMMARY:Laurenz Rettig: Coherent Modulation of Quasiparticle Scattering Rates in a Photoexcited Charge-Density-Wave System DESCRIPTION:J. Maklar\,1 M. Schüler\,2 Y. W. Windsor\,1 C. W. Nicholson\,1 M. Puppin\,1 P. Walmsley\,2\, 3 I. R. Fisher\,2\, 3 M. Wolf\,1 R. Ernstorfer\,1\, 4 M. A. Sentef\,5 L. Rettig1 \n1Fritz-Haber-Institut der Max-Planck-Gesellschaft\, Faradayweg 4-6\, 14195 Berlin\, Germany \n2Stanford Institute for Materials and Energy Sciences\, SLAC National Accelerator Laboratory\, 2575 Sand Hill Road\, Menlo Park\, CA 94025\, USA \n3Geballe Laboratory for Advanced Materials and Department of Applied Physics\, Stanford University\, Stanford\, CA 94305\, USA \n4Institut für Optik und Atomare Physik\, Technische Universität Berlin\, Straße des 17. Juni 135\, 10623 Berlin\, Germany \n5Max Planck Institute for the Structure and Dynamics of Matter\, Luruper Chaussee 149\, 22761 Hamburg\, Germany \nFundamental quasiparticle interactions in solids such as electron-electron and electron-phonon scattering are of fundamental importance e.g. for electronic and optical material properties. While for simple systems such as quasi-free electron gases\, fairly good descriptions have been reached\, for more complex solids\, it remains highly challenging to unravel their intricate interplay\, and to identify the dominant channels. Additional challenges arise from broken-symmetry ground states emerging due to strong correlations in complex quantum materials. A way to tackle this problem is by tracking a material’s dynamical response after ultrafast optical excitation\, as this approach yields direct insight into energy dissipation and scattering processes on their intrinsic timescales. In addition\, tailored photoexcitation also provides a way to dynamically control specific material properties\, and thereby modify the material’s intrinsic interaction channels. \nHere\, we combine these two approaches\, by tracking the fundamental quasiparticle interactions during a photoinduced insulator-to-metal phase transition in a charge-density-wave (CDW) material. Using time- and angle-resolved photoemission spectroscopy (trARPES)\, we study the transient electronic structure of the prototypical CDW compound TbTe3. By employing strong optical excitation\, we suppress the CDW energy gap at the Fermi level\, thereby driving the system into a transient metallic state\, followed by a coherent evolution of the system within the transient CDW potential [1]. Simultaneously\, we track the relaxation of highly excited\, hot quasiparticles\, and find a highly unusual modulation of their relaxation rate. State-of-the-art calculations based on non-equilibrium Green’s functions provide a microscopic view onto the interplay of quasiparticle scattering and the (transiently modified) electronic band structure\, which allow us to quantify the modification of particle-hole scattering processes due to the influence of the CDW energy gap [2]. \n\nJ. Maklar\, et al.\, Nat. Commun. 12\, 2499 (2021)\nJ. Maklar\, et al.\, arXiv:2108.12323 (2021)\n\n\n\n\n\nWatch the lecture:\n\n \n Protected Area\n This content is password-protected. Please verify with a password to unlock the content. \n \n \n Enter your password\n \n \n Unlock URL:https://nqw.ijs.si/event/laurenz-rettig-coherent-modulation-of-quasiparticle-scattering-rates-in-a-photoexcited-charge-density-wave-system/ CATEGORIES:NQW 2021 END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20211212T181000 DTEND;TZID=Europe/Ljubljana:20211212T200000 DTSTAMP:20260810T030552 CREATED:20211201T212912Z LAST-MODIFIED:20231201T192850Z UID:1880-1639332600-1639339200@nqw.ijs.si SUMMARY:Dinner DESCRIPTION: URL:https://nqw.ijs.si/event/dinner/ CATEGORIES:NQW 2021 END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20211212T195900 DTEND;TZID=Europe/Ljubljana:20211212T210500 DTSTAMP:20260810T030552 CREATED:20211203T222738Z LAST-MODIFIED:20211207T074535Z UID:2046-1639339140-1639343100@nqw.ijs.si SUMMARY:Chair: Jacek Herbrych DESCRIPTION: URL:https://nqw.ijs.si/event/chair-jacek-herbrych/ CATEGORIES:NQW 2021 END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20211212T200000 DTEND;TZID=Europe/Ljubljana:20211212T201500 DTSTAMP:20260810T030552 CREATED:20211201T213848Z LAST-MODIFIED:20211213T081724Z UID:1940-1639339200-1639340100@nqw.ijs.si SUMMARY:Anze Mraz: Nanocryotron-driven Charge Configuration Memory devices DESCRIPTION:Anže Mraz\,1\,4 Rok Venturini\,1\,3 Damjan Svetin\,1\,2 Vitomir Sever\,1 Ian A. Mihailovic\,1 Jan Ravnik\,1\,5 Igor Vaskivskyi\,1\,2 Tevž Lotrič\,1 Bor Brezec\,1 Matic Merljak\,1 Maria D’Antuono\,6 Daniela Stornaiulo\,6 Francesco Tafuri\,6 Dimitrios Kazazis\,5 Yasin Ekinci\,5 Viktor. V. Kabanov1 and Dragan Mihailovic1\,2 \n1Jozef Stefan Institute\, Dept. of Complex Matter\, Jamova 39\, SI-1000 Ljubljana\, Slovenia2CENN Nanocenter\, Jamova 39\, SI-1000 Ljubljana\, Slovenia3Faculty for Mathematics and Physics\, University of Ljubljana\, Jadranska 19\, SI-1000 Ljubljana\, Slovenia \n4Faculty for Electrical Engineering\, University of Ljubljana\, Tržaška 25\, SI-1000 Ljubljana\, Slovenia5LMN-Paul Scherrer institute\, Villigen\, Switzerland6Dept. of Physics\, University of Naples and CNR-SPIN\, Naples\, Italy \nFor some time\, cryo-computing has been severely limited by the absence of a suitable fast and energy efficient low-temperature memory1\,2making it an ideal platform for energy efficient memories. Conventional superconducting memories use an architecture based on Josephson junctions (JJs. Ideally\, such memory should be compatible with single-flux quantum (SFQ) logic in terms of speed\, switching energy and matching impedance. Here we present an implementation of non-volatile charge configuration memory (CCM)3\,4 in a cryo-computing environment with a hybrid device incorporating a superconducting nanowire cryotron (nTron)5. The dynamical response of the device is modelled in terms of the superconducting order parameter in a confined channel of a current-controlled nanowire with a CCM shunt6geared towards understanding and controlling coherence and dissipation in nanowires. The dynamics is probed by measuring the evolution of the V-I characteristics and the distributions of switching and retrapping currents upon varying the shunt resistor and temperature. Theoretical analysis of the experiments indicates that as the value of the shunt resistance is decreased\, the dynamics turns more coherent presumably due to stabilization of phase-slip centers in the wire and furthermore the switching current approaches the Bardeen’s prediction for equilibrium depairing current. By a detailed comparison between theory and experimental\, we make headway into identifying regimes in which the quasi-one-dimensional wire can effectively be described by a zero-dimensional circuit model analogous to the RCSJ (resistively and capacitively shunted Josephson junction. Analysis of time-dynamics and current-voltage characteristics based on measured device parameters show that single flux quantum (SFQ)-level pulses can drive non-volatile CCM on the picosecond timescale. We also present first measured current-voltage characteristics and read operation of actual hybrid memory devices showing expected behaviour. \nThe inherent high energy efficiency and ultrahigh speed makes this hybrid device an ideal memory for use in cryo-computing and quantum computing peripheral devices. \n  \n\nQ.-Y. Zhao\, et al. Superconductor Science and Technology 31\, 035009 (2018).\nD.S.Holmes et al\, IEEE Trans. Appl. Supercond. 23\, 1701610–1701610 (2013).\nI. Vaskivskyi et al. Nat. Comm. 7\, 11442 (2016).\nD. Mihailovic et al.\, APL 119\, 013106 (2021).\nA.N. McCaughan\, & K.K. Berggren\, A Nano Letters 14\, 5748–5753 (2014).\nM.W.Brenner\,et al.\, Phys. Rev. B 85\, 224507 (2012).\n\n\n\n\n\nWatch the lecture:\n\n \n Protected Area\n This content is password-protected. Please verify with a password to unlock the content. \n \n \n Enter your password\n \n \n Unlock URL:https://nqw.ijs.si/event/anze-mraz-nanocryotron-driven-charge-configuration-memory-devices/ CATEGORIES:NQW 2021 END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20211212T201500 DTEND;TZID=Europe/Ljubljana:20211212T204000 DTSTAMP:20260810T030552 CREATED:20211201T213719Z LAST-MODIFIED:20211204T091439Z UID:1921-1639340100-1639341600@nqw.ijs.si SUMMARY:Robin Steinigeweg: Nontrivial damping of quantum many-body dynamics DESCRIPTION:T. Heitmann\,1 J. Richter\,2 J. Gemmer\,1 R. Steinigeweg1 \n1University Osnabrück\, Physics Department\, D-49076 Osnabrück\, Germany \n2University College London\, Department of Physics and Astronomy\, London WC1E 6BT\, UK \nUnderstanding how the dynamics of a given quantum system with many degrees of freedom is altered by the presence of a generic perturbation is a notoriously difficult question. Recent works predict that\, in the overwhelming majority of cases\, the unperturbed dynamics is just damped by a simple function\, e.g.\, exponentially as expected from Fermi‘s Golden Rule. While these predictions rely on random-matrix arguments and typicality\, they can only be verified for a specific physical situation by comparing to the actual solution or measurement. Crucially\, it also remains unclear how frequent and under which conditions counterexamples to the typical behavior occur. In this work\, we discuss this question from the perspective of projection-operator techniques\, where exponential damping of a density matrix occurs in the interaction picture but not necessarily in the Schrödinger picture. We show that a nontrivial damping in the Schrödinger picture can emerge if the dynamics in the unperturbed system possesses rich features\, for instance due to the presence of strong interactions. This suggestion has consequences for the time dependence of correlation functions. We substantiate our theoretical arguments by large-scale numerical simulations of charge transport in the extended Fermi-Hubbard chain\, where the nearest-neighbor interactions are treated as a perturbation to the integrable reference system. \n\nT. Heitmann\, J. Richter\, J. Gemmer\, R. Steinigeweg\, arXiv:2103.06646. URL:https://nqw.ijs.si/event/robin-steinigeweg-nontrivial-damping-of-quantum-many-body-dynamics/ CATEGORIES:NQW 2021 END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20211212T204000 DTEND;TZID=Europe/Ljubljana:20211212T210500 DTSTAMP:20260810T030552 CREATED:20211201T213330Z LAST-MODIFIED:20211213T081812Z UID:1900-1639341600-1639343100@nqw.ijs.si SUMMARY:Miroslav Hopjan: Detecting delocalization-localization transitions from full density distributions DESCRIPTION:M. Hopjan\,1 G. Orso\,2 F. Heidrich-Meisner1 \n1Institut für Theoretische Physik\, Georg-August-Universitat Göttingen\,Friedrich-Hund-Platz 1\, 37077 Göttingen\, Germany \n2Laboratoire Matériaux et Phénomènes Quantiques\, Université de Paris\, CNRS\, F-75013\, Paris\, France \nCharacterizing the delocalization transition in closed quantum systems with a many-body localized phase is a key open question in the field of nonequilibrium physics. We exploit the fact that localization of particles as realized in Anderson localization and standard many-body localization (MBL) implies Fock-space localization in single-particle basis sets characterized by a real-space index. Using a recently introduced quantitative measure for Fock-space localizationcomputed from the density distributions\, the occupation distance [1]\, we systematically study its scaling behavior across delocalization transitions [2]. \nWe first identify critical points from scaling collapses of numerical data with an excellent agreement with literature results for the critical disorder strengths of noninteracting fermions\, such as the one-dimensional Aubry-André model and the three-dimensional Anderson model. We then observe a distinctively different scaling behavior in the case of interacting fermions with random disorder consistent with a Kosterlitz-Thouless transition. Finally\, we use our measure to extract the transition point as a function of filling for interactsing fermions [2]. \n\nM. Hopjan and F. Heidrich-Meisner\, Phys. Rev. A 101\, 063617 (2020)\nM. Hopjan\, G. Orso and F. Heidrich-Meisner\, arXiv:2105.10584\, to appear in Phys. Rev. B\n\n\n\n\n\nWatch the lecture:\n\n \n Protected Area\n This content is password-protected. Please verify with a password to unlock the content. \n \n \n Enter your password\n \n \n Unlock URL:https://nqw.ijs.si/event/miroslav-hopjan-detecting-delocalization-localization-transitions-from-full-density-distributions/ CATEGORIES:NQW 2021 END:VEVENT END:VCALENDAR